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You can assess the validity of a digital signature
by checking the signature properties.
- Set your signature verification preferences. For
more information, see Set signature verification preferences.
- Open the PDF containing the signature, right-click the
signature, and then choose Validate Signature. The Signature Validation
Status describes the validity of the signature.
- Click Signature Properties, and do the following:
If the status is unknown, click the Signer
tab, and then click Show Certificate to view the details of the
certificate. If you’re working with self-signed digital IDs, confirm
that the certificate details are valid. If the certificate isn’t
valid, request a valid certificate from the signer. Click OK.
Click the Date/Time tab to verify the timestamp,
if needed.
Click the Legal tab to learn more about the legal
restrictions of the signature. In the Legal tab, click View Document
Integrity Properties to check if it contains items that could alter
its appearance.
If the document was modified after it was signed, check
the signed version of the document and compare it to the current
version.
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